we have booked our holiday for switzerland from 9 april till 12 april and we will be staying in manor farm holiday park. we are family of 4 me and my wife and 2 sons from which one is infant only 5 months old and second one is 4 years old. so need to know about travel pass that what is the cheapest option for travelling in and around interlaken ? because swiss travel pass will cost us £400 for 2 of us for 4 days . is there any regional pass or day pass in which i can get all train , buses,boats and trams free for a day ???